WO2020119591A1

WO2020119591A1 - Three-dimensional printing equipment and scraper assembly therefor

Info

Publication number: WO2020119591A1
Application number: PCT/CN2019/123536
Authority: WO
Inventors: 侯锋
Original assignee: 上海普利生机电科技有限公司
Priority date: 2018-12-11
Filing date: 2019-12-06
Publication date: 2020-06-18
Also published as: EP3895877A1; CN111300821A; EP3895877A4; EP3895877B1; EP3895877C0; US20210323191A1

Abstract

The present invention relates to a scraper assembly for three-dimensional printing equipment, comprising a scraper, a fixing frame, a pulley, and a sliding rail. The scraper is mounted on the fixing frame. The pulley is provided on at least one end of the fixing frame. The sliding rail has a horizontal first rail and an inclined and movable second rail. The first end of the second rail is connected to the first rail and the second end is located above the first rail. When sliding from the middle to an end of the first rail, the pulley enters the second rail from the first end and leaves the second rail from the second end to return to the first rail; and when sliding from the end to the middle of the first rail, the pulley passes through the second rail from below. When pushing printing slurry to move to a side plate of a storage tank, the scraper of the present invention will not squeeze the slurry out of the storage tank, and can better push the printing slurry having high viscosity or low fluidity.

Description

Three-dimensional printing equipment and its scraper assembly

Technical field

The invention relates to a three-dimensional printing device, in particular to a three-dimensional printing device and its scraper assembly.

Background technique

Three-dimensional printing technology is based on the computer three-dimensional design model, through software layered discrete and numerical control forming systems, using laser beams, hot melt nozzles and other methods to deposit metal powder, ceramic powder, plastic, cell tissue and other special materials layer by layer Bonding, and finally superimposed to form a physical product. Unlike the traditional manufacturing industry, which molds and cuts raw materials by means of molds, turning, milling and other mechanical processing methods to finally produce finished products, three-dimensional printing turns three-dimensional entities into several two-dimensional planes. By processing materials and stacking them layer by layer, it greatly Reduced manufacturing complexity. This digital manufacturing model does not require complex processes, huge machine tools, or a lot of manpower. It can generate parts with various shapes and complex shapes directly from computer graphics data, which enables the manufacturing to reach a wider range of production groups. extend.

At present, the molding method of 3D printing technology is still evolving, and the materials used are also diverse. Among various molding methods, the light curing method is a relatively mature method. The light curing method is based on the principle that the light curing material is cured after being irradiated with ultraviolet light, and the material is cumulatively formed, which has the characteristics of high molding accuracy, good surface finish, and high material utilization rate.

A photo-curing three-dimensional printing device is provided with an exposure system at the bottom of the storage tank. The beam pattern projected by the exposure system is irradiated to a layer of photo-curing material at the bottom of the storage tank through the transparent bottom plate of the storage tank to cure it. The cured photo-curable material will adhere to the bottom surface of the carrier board. Each time the exposure system irradiates the beam pattern to cause a layer of photocurable material to cure, the carrier will rise slightly to pull up the layer of photocurable material and allow the photocurable material that is still liquid to flow into the bottom of the storage tank and has been cured Wait for the next irradiation between the materials. Such a cycle will result in a layer-by-layer cumulatively shaped three-dimensional workpiece. In order to avoid the photocuring material at the bottom of the storage tank gradually curing under long-time light leakage, after the carrier board is lifted, a scraper will be used to scrape along the inner bottom surface of the storage tank to remove the remaining photocurable material.

Three-dimensional printers have been used to prepare high-strength ceramic products. It loads a slurry or paste with ceramic powder dispersed in a photo-curable material into a storage tank and performs printing according to the above method. However, as the filling rate of inorganic materials increases, the fluidity of the printing paste or paste will decrease. In this case, the original scraping method will bring some problems. For example, when the scraper pushes the slurry closer to the side wall of the storage tank, a large amount of the pushed slurry cannot be dispersed around the storage tank in time, and it is easy for the scraper to squeeze out the storage tank from above the side wall.

Summary of the invention

The technical problem to be solved by the present invention is to provide a three-dimensional printing device and its scraper assembly, which can avoid pushing the printing paste out of the storage tank when it is pushed.

The technical solution adopted by the present invention to solve the above technical problems is a scraper assembly of a three-dimensional printing device, including a scraper, a fixing frame, a pulley and a slide rail, the scraper is installed on the fixing frame, the pulley It is arranged on at least one end of the fixing frame, characterized in that the slide rail has a horizontal first rail and an inclined and movable second rail, and the first end of the second rail is connected to the first rail And the second end is located above the first track; wherein when the pulley slides from the middle to the end of the first track, it enters the second track from the first end and from the second The end deviates from the second track and returns to the first track; when the pulley slides from the end to the middle of the first track, it passes through the second track from below.

Optionally, there is a rotating shaft above the first track, and the first track has a groove corresponding to the position of the first end of the second track, the groove occupies a part of the width of the first track, so The first end of the second track is placed in the groove, and the second end is provided on the rotating shaft.

Optionally, each of the first rails has two ends, respectively corresponding to two of the second rails.

Optionally, the scraper assembly has two of the first rails and two sets of the pulleys, the two sets of pulleys are respectively disposed at both ends of the fixing frame, and each set of pulleys is adapted to Slide on a track.

Optionally, the scraper has at least one long hole perpendicular to the extending direction of the scraper, and the scraper is installed on the fixing frame through the long hole.

Optionally, the scraper is rigid.

Optionally, the bottom surface of the scraper used for scraping is smooth.

Optionally, the scraper assembly further includes a driving mechanism for driving the fixing frame to move along the slide rail, the driving mechanism includes a motor, a transmission shaft, two transmission gears, and two conveyor belts, the The transmission shaft is connected to the output shaft of the motor, the two transmission gears are provided at both ends of the transmission shaft, the two conveyor belts are respectively driven by the two transmission gears, and the two ends of the fixing frame are respectively provided On the two conveyor belts.

Another aspect of the present invention proposes a three-dimensional printing apparatus characterized by including the above-mentioned blade assembly.

Optionally, the three-dimensional printing device further includes photodetectors adjacent to both ends of the first track.

Compared with the prior art, the present invention adopts the above technical solution, because when the scraper moves to the position near the side plate of the storage tank, it will first rise under the guidance of the slide rail, so that the printing paste can be Release from between the scraper and the bottom surface of the storage tank; after that, the scraper will drop and return to its original height. In this way, when the squeegee pushes the printing paste to move to the side plate of the storage tank, it does not push the paste out of the storage tank. In addition, the use of rigid materials for the squeegee can better promote the printing paste with high viscosity or low fluidity, such as the printing paste containing ceramic powder. Furthermore, the bottom surface of the scraper used for scraping is smooth, which can reduce friction and make it easier to slide. In addition, both ends of the squeegee assembly are driven by a conveyor belt, which makes the driving force strong, which is beneficial to promote the printing paste with high viscosity or low fluidity.

Brief description of the drawings

In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings, in which:

FIG. 1 is a perspective schematic view of a three-dimensional printing device with a scraper assembly according to an embodiment of the invention;

2 is a plan view of a three-dimensional printing apparatus with a squeegee assembly according to an embodiment of the invention;

3A is a left side view corresponding to the three-dimensional printing apparatus of FIG. 1;

3B is a right side view of the three-dimensional printing apparatus corresponding to FIG. 1;

4 is a schematic diagram of a moving route of a scraper assembly according to an embodiment of the invention;

5A is a schematic perspective view of a scraper assembly according to an embodiment of the present invention when it is in a first position during movement;

5B is a top view of the scraper assembly in the first position during movement according to an embodiment of the present invention;

5C is a side view of the scraper assembly according to an embodiment of the present invention when it is in the first position during movement;

6A is a schematic perspective view of a scraper assembly according to an embodiment of the present invention when it is in a second position during movement;

6B is a top view of the scraper assembly in the second position during movement according to an embodiment of the present invention;

6C is a side view of the scraper assembly according to an embodiment of the present invention when it is in the second position during movement;

7A is a schematic perspective view of a scraper assembly in a third position during movement according to an embodiment of the present invention;

7B is a top view of the scraper assembly according to an embodiment of the present invention when it is in the third position during movement;

7C is a side view of the scraper assembly according to an embodiment of the present invention when it is in the third position during movement;

8A is a schematic perspective view of a scraper according to an embodiment of the invention;

8B is a front view of the scraper of an embodiment of the present invention;

FIG. 8C is a side view of a squeegee according to an embodiment of the invention.

Preferred embodiment of the present invention

In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings.

Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein, so the present invention is not limited by the specific embodiments disclosed below.

In detailing the embodiments of the present invention, for ease of explanation, the cross-sectional view showing the structure of the device will not be partially enlarged at a general scale, and the schematic diagram is only an example, which should not limit the scope of protection of the present invention. In addition, the actual production should include the three-dimensional dimensions of length, width and depth.

As shown in the present invention and claims, unless the context clearly indicates an exception, the words "a", "an", and/or "the" are not specific to the singular but may include the plural. In general, the terms "include" and "include" only suggest that steps and elements that are clearly identified are included, and these steps and elements do not constitute an exclusive list, and the method or device may also contain other steps or elements.

For convenience of description, spatial relations such as “below”, “below”, “below”, “below”, “above”, “above”, etc. may be used here to describe an element shown in the drawings Or the relationship between features and other elements or features. It will be understood that these spatial relationship words are intended to encompass other directions of the device in use or in operation than those depicted in the drawings. For example, if the device in the figures is turned over, the orientation of elements described as “below” or “beneath” or “below” other elements or features would be changed to “above” the other elements or features. Thus, the exemplary words "below" and "below" can encompass both up and down directions. The device may also have other orientations (rotated 90 degrees or in other directions), so the spatial relationship descriptors used here should be interpreted accordingly. In addition, it will also be understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present.

In the context of the present invention, a structure in which the first feature described is "on" the second feature may include embodiments where the first and second features are formed in direct contact, or may include additional features formed in the first and Examples between the second features, so that the first and second features may not be in direct contact.

FIG. 1 is a schematic perspective view of a three-dimensional printing apparatus with a squeegee assembly 100 according to an embodiment of the invention. Referring to FIG. 1, the three-dimensional printing apparatus has a storage tank 200 for loading three-dimensional printing paste. Generally, the storage tank 200 is rectangular in shape, and has a bottom plate and four side plates. For convenience of subsequent description, the four side plates of the storage tank 200 are referred to as a first side plate 201, a second side plate 202, a third side plate 203, and a fourth side plate 204, respectively. The scraper assembly 100 includes a scraper 110, a fixing frame 120, a pulley 130, and a slide rail 140.

The fixing frame 120 spans the two side plates at the opposite positions of the storage tank 200. The fixing frame 120 shown in FIG. 1 spans the first side plate 201 and the second side plate 202 of the storage tank 200. It can be understood that FIG. 1 is an example, and the fixing frame 120 may also span the third side plate 203 and the fourth side plate 204. The fixing frame 120 has a concave shape with both ends high and the middle low. The two ends of the fixing frame 120 are higher than the side plates of the storage tank 200, the middle section is lower, penetrates into the groove of the storage tank 200, and is higher than the bottom plate of the storage tank 200. The overall length of the fixing frame 120 is greater than the distance between the two side plates of the storage tank 200 that it spans, that is to say, both ends of the fixing frame 120 extend out of the two side plates of the storage tank 200 outer.

The scraper 110 is installed in the middle section of the fixing frame 120, and the installed scraper 110 just fits the bottom plate of the storage tank 200, so that when the fixing frame 120 slides along the slide rail 140, the scraper can be driven 110 moves to remove the solidified material remaining on the bottom plate of the storage tank 200. It can be understood that the length of the scraper 110 is smaller than the length of the side of the bottom plate of the storage tank 200 parallel to the scraper 110, so that the scraper 110 can move smoothly in the storage tank 200.

Referring to FIG. 1, there are several round holes in the middle section of the fixing frame 120. In an embodiment, the squeegee 110 has at least one long hole perpendicular to the extending direction of the squeegee, and the position of the long hole corresponds to the position of the round hole on the fixing frame 120. Align the long holes on the scraper 110 with the round holes on the fixing frame 120, and then fix the scraper 110 on the fixing frame 120 by using bolts and other workpieces. Adjust the relative position of the long hole on the scraper 110 and the round hole on the fixing frame 120 as needed, that is, the height of the scraper 110 can be adjusted, that is, the distance between the scraper 110 and the bottom plate of the storage tank 200 can be adjusted.

At least one end of the fixing frame 120 is provided with a pulley 130. FIG. 2 shows an embodiment in which one pulley 130 is provided at each end of the fixing frame 120. The function of the pulley 130 is that when the fixing frame 120 is moving, the pulley 130 moves along the sliding rail 140, and the pulley 130 contacts the sliding rail 140.

The slide rail 140 is composed of two parts, including a first rail 141 extending in a horizontal direction and a second rail 142 that is inclined and movable. The first rail 141 is in the shape of a rectangular plate, and stands on the outside of the side plate of the storage tank 200, and is parallel to the side plate of the storage tank 200 spanned by the fixing frame 120, with the narrow side facing upwards as a rail. As shown in FIG. 1, the first rail 141 is parallel to the first side plate 201 of the storage tank 200 and is located outside the first side plate 201. The first rail 141 is also located below the end of the fixing frame 120. When the fixing frame 120 is moving, the pulley 130 provided at the end of the fixing frame 120 moves along the first rail 141.

The second rail 142 has a rectangular plate shape. Compared with the first rail 141, the second rail 142 has a smaller size. In one embodiment, the second rail 142 is located at the end 144 of the first rail 141. The second track 142 includes a first end 145 and a second end 146. The first end 145 of the second rail 142 is in active contact with the first rail 141. In an embodiment, the first rail 141 has a groove 143 at a position corresponding to the first end of the second rail 142. The groove 143 occupies a part of the width of the first rail 141. As shown in FIG. 1, the groove 143 is located outside the first rail 141 to ensure that the pulley 130 can move smoothly on the first rail 141. The first end 145 of the second track 142 is placed in the groove 143.

The second end 146 of the second rail 142 is located above the first rail 141 and is connected to a support frame 160 via a rotating shaft 161. The second end 146 of the second rail 142 can rotate about the rotating shaft 161. The support frame 160 is fixed to the outside of the end 144 of the first rail 141, and is used to fix the second end 146 of the second rail 142 through the rotating shaft 161.

When the 3D printing device activates the squeegee assembly 100, the fixing frame 120 will move along the first side plate 201 and the second side plate 202 of the storage tank 200. At this time, the pulley 130 at the end of the fixing frame 120 will move along The first rail 141 slides. When the pulley 130 moves in the first direction D1, that is, from the middle of the first rail 141 to the end 144, the pulley 130 enters the first end 145 of the second rail 142 and follows the The inclined surface moves upward. When the pulley 130 reaches the second end 146 of the second rail 142, it disengages from the second rail 142 and falls back onto the first rail 141 below it.

When the pulley 130 moves in the second direction D2, that is, when it moves from the end 144 to the middle of the first rail 141, it passes through the second rail 142 from below the second rail 142. When the pulley 130 passes the first end 145 of the second rail 142, the first end 145 is movable, so the first end 145 will be pushed up by the pulley 130. After the pulley 130 passes the first end 145, the first end 145 falls back into the groove 143 of the first track 141 again under the action of gravity.

With this technical solution, when the scraper 110 moves to a position close to the side plate of the storage tank 200, it will first rise under the guidance of the slide rail 140, so that the printing paste can be removed from the scraper 110 and the storage tank 200 It is released between the inner bottom surface; after that, the squeegee 110 will descend and return to its original height. In this way, the scraper 110 does not push the printing paste out of the storage tank 200 when the printing paste moves toward the side plate of the storage tank 200.

In an embodiment, a second track 142 is disposed corresponding to an end 144 of the first track 141. In another embodiment, two second rails 142 are respectively disposed on the two ends 144 of the first rail 141. It can be understood that the configuration of the two second rails 142 enables the scraper 110 to prevent the slurry from being pushed out of the storage tank 200 when scraping in both directions.

In addition, it can be understood that the pulley 130 and the slide rail 140 in the present invention are configured as a set. In one embodiment, a pulley 130 is provided only at one end of the fixing frame 120, and a slide rail 140 is provided outside the corresponding side of the storage tank 200. In a preferred embodiment, pulleys 130 are provided at both ends of the fixing frame 120, and correspondingly, slide rails 140 are provided on both sides corresponding to the storage tank 200, as shown in FIG. 1.

Referring to FIG. 1, the scraper assembly 100 of the present invention further includes a driving mechanism 150 for driving the fixing frame 120 to move along the slide rail 140. The driving mechanism 150 includes a motor 151, a transmission shaft 152, a transmission gear 153, and a conveyor belt 154.

The motor 151 is fixedly installed on the outer side of the storage tank 200 for generating driving power. The transmission shaft 152 is a cylindrical long shaft, which is disposed outside the storage tank 200 and has a height higher than that of the side plate of the storage tank 200.

The transmission shaft 152 is disposed parallel to the extending direction of the scraper 110. The transmission shaft 152 is located outside the third side plate 203 of the storage tank 200 and parallel to the third side plate 203, and its length is slightly longer than that of the third side plate 203. The transmission shaft 152 is connected to the output shaft 155 of the motor 151. When the motor 151 works to drive the output shaft 155 to rotate, it also drives the transmission shaft 152 to rotate at the same time.

A transmission gear 153 is provided at each end of the transmission shaft 152. The two conveyor belts 154 are respectively located at both ends of the fixing frame 120 and are arranged perpendicular to the extending direction of the scraper 110. The conveyor belt 154 is parallel to the first side plate 201 of the storage tank 200. One end of the conveyor belt 154 bypasses the transmission gear 153, and the other end bypasses the first interlocking shaft 156 provided outside the first side plate 201 of the storage tank 200. The height of the first interlocking shaft 156 and the transmission gear 153 are the same, so that the conveyor belt 154 provided between the first interlocking shaft 156 and the transmission gear 153 is in a horizontal state. The conveyor belt 154 is connected to the end of the fixing frame 120 so that the fixing frame 120 can move along the slide rail 140 under the driving of the conveyor belt 154. When the motor 151 works, the transmission gear 153 rotates, driving the conveyor belt 154 to move between the transmission gear 153 and the first interlocking shaft 156, and at the same time driving the fixing frame 120 to move, and further driving the scraper 110 to move. It can be understood that, in this embodiment, the position and size of the transmission gear 153 and the first interlocking shaft 156 need to be considered so as not to hinder the movement of the fixing frame 120 along the slide rail 140.

In an embodiment, the driving mechanism 150 further includes two second linkage shafts 157. One second interlocking shaft 157 is fixedly installed above the transmission gear 153 and is not in contact with the transmission gear 153, and the other second interlocking shaft 157 is fixedly installed above the first interlocking shaft 156 and is not interlocked with the first The shaft 156 is in contact. The two second interlocking shafts 157 have the same height, so that the conveyor belt 154 disposed between the two second interlocking shafts 157 is in a horizontal state. One end of the conveyor belt 154 simultaneously bypasses the transmission gear 153 and the second interlocking shaft 157 above it, and the other end of the conveyor belt 154 simultaneously bypasses the first interlocking shaft 156 and the second interlocking shaft 157 above it. The conveyor belt 154 surrounds the transmission gear 153, the first interlocking shaft 156, and the two second interlocking shafts 157 inside it, and is supported by these components. Referring to FIG. 1, the two second interlocking shafts 157 increase the distance between the conveyor belt 154 in two directions, and provide enough space for the end of the fixing frame 120 to move along the slide rail 140.

It can be understood that, corresponding to the two ends of the fixing frame 120, two sets of transmission gears 153, a conveyor belt 154, a first interlocking shaft 156, and a second interlocking shaft are provided at corresponding externally symmetrical positions on both sides of the storage tank 200 157. The driving mechanism 150 can provide a strong driving force for the squeegee assembly 100, which is beneficial to the squeegee 110 to push the printing paste with high viscosity or low fluidity.

In other embodiments, the driving mechanism for driving the fixing frame 120 to move along the slide rail 140 may also be a linear motor or other device that can generate a driving force.

In an embodiment, the three-dimensional printing apparatus of the present invention further includes a photodetector 147. The photodetector 147 is adjacent to both ends of the first track 141. FIG. 1 shows one photodetector 147 adjacent to one end of the first track 141. Due to the angle of view, another photodetector 147 adjacent to the other end of the first track 141 is not shown in FIG. 1. The positions of the photodetectors 147 are symmetrical to each other. When the fixing frame 120 moves along the slide rail 140 to the end 144 of the first rail 141, the light detector 147 detects the position of the fixing frame 120 and makes a judgment, and when the fixing frame 120 has reached the preset position, the light detection The actuator 147 sends out the in-position signal to instruct the motor 151 of the driving mechanism 150 to stop working or change direction. The light detector 147 can provide an indication of the position where the squeegee assembly 100 moves, so as to realize the automatic operation of the squeegee assembly 100.

2 is a top view of a three-dimensional printing apparatus with a squeegee assembly 100 according to an embodiment of the invention. Referring to FIG. 2, the position of the pulley 130 in this embodiment can be explained more clearly. The pulley 130 is located at the end of the fixing frame 120 and above the first rail 141. The two second rails 142 are located at the two ends 144 of the first rail 141 respectively.

3A and 3B respectively correspond to the left side view and the right side view of the three-dimensional printing apparatus shown in FIG. 1, which can clearly indicate the position and height relationship between the components shown in the figure. Referring to FIGS. 3A and 3B, the slide rails 140 and related components on both sides of the fixing frame 120 are symmetrically distributed. A support frame 160 is provided at each end 144 near the first rail 141. The height of the support frame 160 is higher than that of the first rail 141. A rotating shaft 161 is provided at the upper end of the support frame 160 to fix the second end 146 of the second rail 142 through the rotating shaft 161. The first track 141 has a groove 143 at a position corresponding to the first end 145 of the second track 142, and the groove 143 has a certain depth. The first end 145 of the second track 142 is movably disposed in the groove 143. There is a certain height difference between the positions of the first end 145 and the second end 146 of the second rail 142, so that in a natural state, the second rail 142 is inclined.

As shown in FIG. 3B, at this time, the pulley 130 at one end of the fixing frame 120 is located at one end 144 of the first rail 141. The pulley 130 is a roller having a circular cross section. Its diameter is smaller than the distance between the rotating shaft 161 on the support frame 160 and the first rail 141, so that the pulley 130 can pass under the second rail 142. When the pulley 130 moves from the end 144 to the middle of the first rail 141, it first passes under the second end 146 of the second rail 142, after which, the pulley 130 gradually lifts the second rail 142 and makes the second rail 142 The first end 145 leaves the groove 143 on the first track 141. After the pulley 130 completely passes through the second rail 142, the first end 145 of the second rail 142 falls back into the groove 143 of the first rail 141 under the influence of gravity.

FIG. 4 is a schematic diagram of the moving route of the squeegee assembly 100 according to an embodiment of the invention. During the printing process of the three-dimensional printing device, the scraper assembly 100 is located inside a certain side of the storage tank 200. When the scraper assembly 100 needs to work, the scraper assembly 100 moves from one end of the first rail 141 to the other end of the first rail 141, and stays at the other end, waiting for the next time the scraper assembly 100 needs to work, then Return to one end of the first track 141 along the same route. Referring to FIG. 4, the moving direction of the squeegee assembly 100 is divided into two types, namely, the first direction D1 when moving from the middle of the first rail 141 to the end 144, and from the end 144 of the first rail 141 to The second direction D2 when the middle moves.

5 to 7 show schematic diagrams of the squeegee assembly 100 in different positions during movement.

5A-5C show schematic diagrams when the squeegee assembly 100 is in the first position, that is, when the squeegee assembly 100 is moved to the middle of the storage tank 200. Referring to FIGS. 5A and 5B, at this time, the pulley 130 located at both ends of the fixing frame 120 in the scraper assembly 100 is located in the middle of the first rail 141, and the pulley 130 is in contact with the first rail 141. FIG. 5C also shows a route in which the pulley 130 in the first position may move. When the squeegee assembly 100 moves in the first direction D1, for example, to the left, the pulley 130 first moves to the left along the first rail 141 until it approaches the second rail 142 to the left of the first rail 141, the pulley 130 will Enter the first end 145 of the second rail 142 and move upward along the inclined surface of the second rail 142. When the pulley 130 reaches the second end 146 of the second rail 142, it disengages from the second rail 142 and It falls back onto the first track 141 below it.

6A-6C show schematic diagrams when the squeegee assembly 100 is in the second position, that is, the squeegee assembly 100 is about to reach the side of the storage tank 200. Referring to FIGS. 6A and 6B, at this time, the pulley 130 at both ends of the fixing frame 120 in the scraper assembly 100 is located on the second rail 142, indicating that the pulley 130 is moved from the first position to the second position, that is, along The first direction D1 moves. Referring to FIG. 6C, the pulley 130 has just reached the first end 145 of the second rail 142, and then will continue to move upward along the inclined surface of the second rail 142, when the pulley 130 reaches the second end 146 of the second rail 142 After that, it detaches from the second track 142 and falls back onto the first track 141 below it.

7A-7C show schematic diagrams when the squeegee assembly 100 is in the third position, that is, the squeegee assembly 100 moves from the side of the storage tank 200 to the middle below the second rail 142. 7A and 7B, in this embodiment, the scraper assembly 100 is moved from the left side of the storage tank 200 to the middle. At this time, the pulley 130 moves on the first rail 141, and the position of the pulley 130 is just below the second rail 142. When the pulley 130 is about to pass the first end 145 of the second track 142, the first end 145 is movable, so the first end 145 will be pushed up by the pulley 130. After the pulley 130 passes the first end 145, the first The end 145 falls back into the groove 143 of the first rail 141 again under the action of gravity. After that, the scraper assembly 100 continues to move to the right side of the storage tank 200, and the pulley 130 successively passes the first position and the second position, passes the second rail 142, and falls back to the first rail 141 below it.

It can be understood that the moving process of the squeegee assembly 100 is mainly illustrated by the three positions in FIGS. 5 to 7, and those skilled in the art can infer that the squeegee assembly 100 is in the position shown in FIGS. 5 to 7 The state when outside the position.

8A to 8C are schematic diagrams of the squeegee 110 according to an embodiment of the invention. FIG. 8A shows the blade 110, the fixing frame 120, and the pulley 130 in the blade assembly 100 according to an embodiment of the present invention. Referring to FIG. 8B, it can be seen that the scraper 110 is fixedly installed on the fixing frame 120 and is recessed in the middle section. In this embodiment, the length of the scraper 110 is smaller than the middle section of the fixing frame 120. Referring to FIG. 8C, in this embodiment, the scraper 110 is a sheet with an acute angle at one end, so as to scrape the printing paste at the bottom of the storage tank 200.

In one embodiment, the material of the squeegee is rigid, so as to scrape the printing paste with higher viscosity.

In one embodiment, the bottom surface of the scraper used for scraping is smooth, which can reduce friction and make sliding easier.

Although the above disclosure discusses some currently considered useful embodiments of the invention through various examples, it should be understood that such details are for illustrative purposes only, and the appended claims are not limited to the disclosed embodiments, but instead, the rights The requirements are intended to cover all modifications and equivalent combinations that conform to the essence and scope of the embodiments of the present invention. For example, although the system components described above can be implemented by hardware devices, they can also be implemented by software solutions only, such as installing the described system on an existing server or mobile device.

For the same reason, it should be noted that, in order to simplify the expression of the present disclosure and thereby help to understand one or more embodiments of the invention, in the foregoing description of the embodiments of the present invention, various features may sometimes be combined into one embodiment, In the drawings or its description. However, this method of disclosure does not mean that the object of the present invention requires more features than those mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiments disclosed above.

Some embodiments use numbers describing the number of components and attributes. It should be understood that such numbers used in embodiment descriptions use the modifiers "about", "approximately", or "generally" in some examples. Grooming. Unless otherwise stated, "approximately", "approximately" or "substantially" indicates that the figures allow a variation of ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, and the approximate values may be changed according to characteristics required by individual embodiments. In some embodiments, the numerical parameters should consider the specified significant digits and adopt the method of general digit retention. Although the numerical fields and parameters used to confirm the breadth of their ranges in some embodiments of the present invention are approximate values, in specific embodiments, the setting of such numerical values is as accurate as possible within the feasible range.

Although the present invention has been described with reference to the current specific embodiments, those of ordinary skill in the art should realize that the above embodiments are only used to illustrate the present invention and can be done without departing from the spirit of the present invention Various equivalent changes or substitutions are made, so as long as the changes and modifications to the above embodiments are within the spirit of the present invention, they will fall within the scope of the claims of the present invention.

Claims

A squeegee assembly of a three-dimensional printing device includes a squeegee, a fixing frame, a pulley, and a slide rail, the squeegee is installed on the fixing frame, and the pulley is provided on at least one end of the fixing frame, characterized in that ,

The slide rail has a horizontal first rail and a tilted and movable second rail, the first end of the second rail is connected to the first rail and the second end is located above the first rail; wherein When the pulley slides from the middle to the end of the first track, it enters the second track from the first end and disengages from the second track from the second end to return to the first Rail; when the pulley slides from the end of the first rail to the middle, passes through the second rail from below.
The squeegee assembly according to claim 1, wherein the first rail has a rotating shaft, and the first rail has a groove corresponding to a position of the first end of the second rail, the groove Occupying a part of the width of the first track, the first end of the second track is placed in the groove, and the second end is provided on the rotating shaft.
The squeegee assembly according to claim 1 or 2, wherein each of the first rails has two end portions, respectively corresponding to two of the second rails.
The squeegee assembly according to claim 1, characterized in that it has two of the first rails and two sets of the pulleys, the two sets of pulleys are placed at both ends of the fixing frame, each set of pulleys is suitable Yu slides on one of the first tracks.
The squeegee assembly according to claim 1, wherein the squeegee has at least one long hole perpendicular to the extending direction of the squeegee, and the squeegee is mounted on the fixing frame through the long hole.
The squeegee assembly of claim 1, wherein the squeegee is rigid.
The squeegee assembly according to claim 1, wherein the bottom surface of the squeegee for scraping is smooth.
The squeegee assembly according to claim 1, further comprising a driving mechanism for driving the fixing frame to move along the slide rail, the driving mechanism includes a motor, a transmission shaft, two transmission gears and Two transmission belts, the transmission shaft is connected to the output shaft of the motor, the two transmission gears are provided at both ends of the transmission shaft, the two transmission belts are respectively driven by the two transmission gears, and the fixed The two ends of the rack are respectively set on the two conveyor belts.
A three-dimensional printing device, characterized in that it comprises the scraper assembly according to any one of claims 1-8.
The three-dimensional printing apparatus according to claim 9, further comprising photodetectors adjacent to both ends of the first track.